Mercurial > dropbear
annotate cli-runopts.c @ 64:efb5e0b335cf
TCP forwarding works.
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 12 Aug 2004 13:48:42 +0000 |
| parents | 20563735e8b5 |
| children | 38c3146aa23d |
| rev | line source |
|---|---|
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1 /* |
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2 * Dropbear - a SSH2 server |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * All rights reserved. |
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6 * |
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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8 * of this software and associated documentation files (the "Software"), to deal |
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9 * in the Software without restriction, including without limitation the rights |
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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11 * copies of the Software, and to permit persons to whom the Software is |
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12 * furnished to do so, subject to the following conditions: |
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13 * |
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14 * The above copyright notice and this permission notice shall be included in |
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15 * all copies or substantial portions of the Software. |
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16 * |
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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23 * SOFTWARE. */ |
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24 |
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25 #include "includes.h" |
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26 #include "runopts.h" |
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27 #include "signkey.h" |
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28 #include "buffer.h" |
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29 #include "dbutil.h" |
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30 #include "algo.h" |
| 64 | 31 #include "tcpfwd.h" |
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32 |
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33 cli_runopts cli_opts; /* GLOBAL */ |
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34 |
| 47 | 35 static void printhelp(); |
| 36 static void parsehostname(char* userhostarg); | |
| 37 #ifdef DROPBEAR_PUBKEY_AUTH | |
| 38 static void loadidentityfile(const char* filename); | |
| 39 #endif | |
| 64 | 40 #ifdef ENABLE_CLI_ANYTCPFWD |
| 41 static void addforward(char* str, struct TCPFwdList** fwdlist); | |
| 42 #endif | |
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43 |
| 47 | 44 static void printhelp() { |
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45 |
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46 fprintf(stderr, "Dropbear client v%s\n" |
| 47 | 47 "Usage: %s [options] user@host\n" |
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48 "Options are:\n" |
| 47 | 49 "-p <remoteport>\n" |
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50 "-t Allocate a pty\n" |
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51 "-T Don't allocate a pty\n" |
| 47 | 52 #ifdef DROPBEAR_PUBKEY_AUTH |
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53 "-i <identityfile> (multiple allowed)\n" |
| 47 | 54 #endif |
| 64 | 55 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 62 | 56 "-L <listenport:remotehsot:reportport> Local port forwarding\n" |
| 57 #endif | |
| 64 | 58 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 62 | 59 "-R <listenport:remotehost:remoteport> Remote port forwarding\n" |
| 60 #endif | |
| 47 | 61 ,DROPBEAR_VERSION, cli_opts.progname); |
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62 } |
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63 |
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64 void cli_getopts(int argc, char ** argv) { |
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65 |
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66 unsigned int i, j; |
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67 char ** next = 0; |
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68 unsigned int cmdlen; |
| 47 | 69 #ifdef DROPBEAR_PUBKEY_AUTH |
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70 int nextiskey = 0; /* A flag if the next argument is a keyfile */ |
| 47 | 71 #endif |
| 64 | 72 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 62 | 73 int nextislocal = 0; |
| 74 #endif | |
| 64 | 75 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 62 | 76 int nextisremote = 0; |
| 77 #endif | |
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78 |
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79 /* see printhelp() for options */ |
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80 cli_opts.progname = argv[0]; |
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81 cli_opts.remotehost = NULL; |
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82 cli_opts.remoteport = NULL; |
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83 cli_opts.username = NULL; |
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84 cli_opts.cmd = NULL; |
| 47 | 85 cli_opts.wantpty = 9; /* 9 means "it hasn't been touched", gets set later */ |
| 86 #ifdef DROPBEAR_PUBKEY_AUTH | |
| 87 cli_opts.pubkeys = NULL; | |
| 88 #endif | |
| 64 | 89 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 90 cli_opts.localfwds = NULL; | |
| 62 | 91 #endif |
| 64 | 92 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 93 cli_opts.remotefwds = NULL; | |
| 62 | 94 #endif |
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95 opts.nolocaltcp = 0; |
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96 opts.noremotetcp = 0; |
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97 /* not yet |
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98 opts.ipv4 = 1; |
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99 opts.ipv6 = 1; |
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100 */ |
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101 |
| 47 | 102 /* Iterate all the arguments */ |
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103 for (i = 1; i < (unsigned int)argc; i++) { |
| 47 | 104 #ifdef DROPBEAR_PUBKEY_AUTH |
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105 if (nextiskey) { |
| 47 | 106 /* Load a hostkey since the previous argument was "-i" */ |
| 107 loadidentityfile(argv[i]); | |
| 108 nextiskey = 0; | |
| 109 continue; | |
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110 } |
| 47 | 111 #endif |
| 64 | 112 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 113 if (nextisremote) { | |
| 114 TRACE(("nextisremote true")); | |
| 115 addforward(argv[i], &cli_opts.remotefwds); | |
| 116 nextisremote = 0; | |
| 117 continue; | |
| 118 } | |
| 119 #endif | |
| 120 #ifdef ENABLE_CLI_LOCALTCPFWD | |
| 121 if (nextislocal) { | |
| 122 TRACE(("nextislocal true")); | |
| 123 addforward(argv[i], &cli_opts.localfwds); | |
| 124 nextislocal = 0; | |
| 125 continue; | |
| 126 } | |
| 127 #endif | |
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128 if (next) { |
| 47 | 129 /* The previous flag set a value to assign */ |
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130 *next = argv[i]; |
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131 if (*next == NULL) { |
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132 dropbear_exit("Invalid null argument"); |
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133 } |
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134 next = NULL; |
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135 continue; |
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136 } |
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137 |
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138 if (argv[i][0] == '-') { |
| 47 | 139 /* A flag *waves* */ |
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140 |
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141 switch (argv[i][1]) { |
| 47 | 142 case 'p': /* remoteport */ |
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143 next = &cli_opts.remoteport; |
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144 break; |
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145 #ifdef DROPBEAR_PUBKEY_AUTH |
| 47 | 146 case 'i': /* an identityfile */ |
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147 nextiskey = 1; |
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148 break; |
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149 #endif |
| 47 | 150 case 't': /* we want a pty */ |
| 151 cli_opts.wantpty = 1; | |
| 152 break; | |
| 153 case 'T': /* don't want a pty */ | |
| 154 cli_opts.wantpty = 0; | |
| 155 break; | |
| 64 | 156 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 157 case 'L': | |
| 158 nextislocal = 1; | |
| 159 break; | |
| 160 #endif | |
| 161 #ifdef ENABLE_CLI_REMOTETCPFWD | |
| 162 case 'R': | |
| 163 nextisremote = 1; | |
| 164 break; | |
| 165 #endif | |
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166 default: |
| 47 | 167 fprintf(stderr, "Unknown argument '%s'\n", argv[i]); |
| 168 printhelp(); | |
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169 exit(EXIT_FAILURE); |
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170 break; |
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171 } /* Switch */ |
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172 |
| 47 | 173 continue; /* next argument */ |
| 174 | |
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175 } else { |
| 64 | 176 TRACE(("non-flag arg: '%s'", argv[i])); |
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177 |
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178 /* Either the hostname or commands */ |
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179 |
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180 if (cli_opts.remotehost == NULL) { |
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181 |
| 47 | 182 parsehostname(argv[i]); |
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183 |
| 47 | 184 } else { |
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185 |
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186 /* this is part of the commands to send - after this we |
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187 * don't parse any more options, and flags are sent as the |
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188 * command */ |
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189 cmdlen = 0; |
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190 for (j = i; j < (unsigned int)argc; j++) { |
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191 cmdlen += strlen(argv[j]) + 1; /* +1 for spaces */ |
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192 } |
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193 /* Allocate the space */ |
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194 cli_opts.cmd = (char*)m_malloc(cmdlen); |
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195 cli_opts.cmd[0] = '\0'; |
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196 |
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197 /* Append all the bits */ |
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198 for (j = i; j < (unsigned int)argc; j++) { |
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199 strlcat(cli_opts.cmd, argv[j], cmdlen); |
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200 strlcat(cli_opts.cmd, " ", cmdlen); |
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201 } |
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202 /* It'll be null-terminated here */ |
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203 |
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204 /* We've eaten all the options and flags */ |
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205 break; |
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206 } |
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207 } |
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208 } |
| 47 | 209 |
| 210 if (cli_opts.remotehost == NULL) { | |
| 211 dropbear_exit("Bad syntax"); | |
| 212 } | |
| 213 | |
| 214 if (cli_opts.remoteport == NULL) { | |
| 215 cli_opts.remoteport = "22"; | |
| 216 } | |
| 217 | |
| 218 /* If not explicitly specified with -t or -T, we don't want a pty if | |
| 219 * there's a command, but we do otherwise */ | |
| 220 if (cli_opts.wantpty == 9) { | |
| 221 if (cli_opts.cmd == NULL) { | |
| 222 cli_opts.wantpty = 1; | |
| 223 } else { | |
| 224 cli_opts.wantpty = 0; | |
| 225 } | |
| 226 } | |
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227 } |
| 47 | 228 |
| 229 #ifdef DROPBEAR_PUBKEY_AUTH | |
| 230 static void loadidentityfile(const char* filename) { | |
| 231 | |
| 232 struct PubkeyList * nextkey; | |
| 233 sign_key *key; | |
| 234 int keytype; | |
| 235 | |
| 236 key = new_sign_key(); | |
| 237 keytype = DROPBEAR_SIGNKEY_ANY; | |
| 238 if ( readhostkey(filename, key, &keytype) != DROPBEAR_SUCCESS ) { | |
| 239 | |
| 240 fprintf(stderr, "Failed loading keyfile '%s'\n", filename); | |
| 241 sign_key_free(key); | |
| 242 | |
| 243 } else { | |
| 244 | |
| 245 nextkey = (struct PubkeyList*)m_malloc(sizeof(struct PubkeyList)); | |
| 246 nextkey->key = key; | |
| 247 nextkey->next = cli_opts.pubkeys; | |
| 248 nextkey->type = keytype; | |
| 249 cli_opts.pubkeys = nextkey; | |
| 250 } | |
| 251 } | |
| 252 #endif | |
| 253 | |
| 254 | |
| 255 /* Parses a [user@]hostname argument. userhostarg is the argv[i] corresponding | |
| 256 * - note that it will be modified */ | |
| 64 | 257 static void parsehostname(char* orighostarg) { |
| 47 | 258 |
| 259 uid_t uid; | |
| 260 struct passwd *pw = NULL; | |
| 64 | 261 char *userhostarg = NULL; |
| 262 | |
| 263 /* We probably don't want to be editing argvs */ | |
| 264 userhostarg = m_strdup(orighostarg); | |
| 47 | 265 |
| 266 cli_opts.remotehost = strchr(userhostarg, '@'); | |
| 267 if (cli_opts.remotehost == NULL) { | |
| 268 /* no username portion, the cli-auth.c code can figure the | |
| 269 * local user's name */ | |
| 270 cli_opts.remotehost = userhostarg; | |
| 271 } else { | |
| 272 cli_opts.remotehost[0] = '\0'; /* Split the user/host */ | |
| 273 cli_opts.remotehost++; | |
| 274 cli_opts.username = userhostarg; | |
| 275 } | |
| 276 | |
| 277 if (cli_opts.username == NULL) { | |
| 278 uid = getuid(); | |
| 279 | |
| 280 pw = getpwuid(uid); | |
| 281 if (pw == NULL || pw->pw_name == NULL) { | |
| 282 dropbear_exit("Unknown own user"); | |
| 283 } | |
| 284 | |
| 285 cli_opts.username = m_strdup(pw->pw_name); | |
| 286 } | |
| 287 | |
| 288 if (cli_opts.remotehost[0] == '\0') { | |
| 289 dropbear_exit("Bad hostname"); | |
| 290 } | |
| 291 } | |
| 64 | 292 |
| 293 #ifdef ENABLE_CLI_ANYTCPFWD | |
| 294 /* Turn a "listenport:remoteaddr:remoteport" string into into a forwarding | |
| 295 * set, and add it to the forwarding list */ | |
| 296 static void addforward(char* origstr, struct TCPFwdList** fwdlist) { | |
| 297 | |
| 298 char * listenport = NULL; | |
| 299 char * connectport = NULL; | |
| 300 char * connectaddr = NULL; | |
| 301 struct TCPFwdList* newfwd = NULL; | |
| 302 char * str = NULL; | |
| 303 | |
| 304 TRACE(("enter addforward")); | |
| 305 | |
| 306 /* We probably don't want to be editing argvs */ | |
| 307 str = m_strdup(origstr); | |
| 308 | |
| 309 listenport = str; | |
| 310 | |
| 311 connectaddr = strchr(str, ':'); | |
| 312 if (connectaddr == NULL) { | |
| 313 TRACE(("connectaddr == NULL")); | |
| 314 goto fail; | |
| 315 } | |
| 316 | |
| 317 connectaddr[0] = '\0'; | |
| 318 connectaddr++; | |
| 319 | |
| 320 connectport = strchr(connectaddr, ':'); | |
| 321 if (connectport == NULL) { | |
| 322 TRACE(("connectport == NULL")); | |
| 323 goto fail; | |
| 324 } | |
| 325 | |
| 326 connectport[0] = '\0'; | |
| 327 connectport++; | |
| 328 | |
| 329 newfwd = (struct TCPFwdList*)m_malloc(sizeof(struct TCPFwdList)); | |
| 330 | |
| 331 /* Now we check the ports - note that the port ints are unsigned, | |
| 332 * the check later only checks for >= MAX_PORT */ | |
| 333 newfwd->listenport = strtol(listenport, NULL, 10); | |
| 334 if (errno != 0) { | |
| 335 TRACE(("bad listenport strtol")); | |
| 336 goto fail; | |
| 337 } | |
| 338 | |
| 339 newfwd->connectport = strtol(connectport, NULL, 10); | |
| 340 if (errno != 0) { | |
| 341 TRACE(("bad connectport strtol")); | |
| 342 goto fail; | |
| 343 } | |
| 344 | |
| 345 newfwd->connectaddr = connectaddr; | |
| 346 | |
| 347 if (newfwd->listenport > 65535) { | |
| 348 TRACE(("listenport > 65535")); | |
| 349 goto badport; | |
| 350 } | |
| 351 | |
| 352 if (newfwd->connectport > 65535) { | |
| 353 TRACE(("connectport > 65535")); | |
| 354 goto badport; | |
| 355 } | |
| 356 | |
| 357 newfwd->next = *fwdlist; | |
| 358 *fwdlist = newfwd; | |
| 359 | |
| 360 TRACE(("leave addforward: done")); | |
| 361 return; | |
| 362 | |
| 363 fail: | |
| 364 dropbear_exit("Bad TCP forward '%s'", origstr); | |
| 365 | |
| 366 badport: | |
| 367 dropbear_exit("Bad TCP port in '%s'", origstr); | |
| 368 } | |
| 369 #endif |